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When you lift your arms above heart level, gravity helps pull blood out of the vessels in your hands and forearms. Since your heart no longer has to push blood uphill, the hydrostatic pressure in those vessels drops — meaning less blood pooling in the tissues and a quick change in color and fullness.⁣ ⁣ It’s the same reason your hands look puffier when they hang by your sides and slimmer when you lift them overhead. Simple biomechanics circulatory physics at work.⁣ ⁣ Your body is constantly adju
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